[Feature Request] Support sorting of __all__

[kkirsche]

I am requesting/suggesting that isort add support for formatting the __all__ variable used to declare public objects of a module. Currently, isort will sort the imports but will not sort the list of objects that the developer imported.

I understand that this may not be a direct fit for the tool, but as this is related to the import/export of objects from a module, I felt this would be a valuable addition.

Thank you for the great tool

[kkirsche]

Oops, this is supported via #1358 — sorry!